May not be original, but this thing makes a message appear on a certain day. Can be modified to have messages appear on different days. The message should appear in the space below in a larger font.

I set the day for the message as the 4th of July. If you want it to appear today, just change the date and month settings for the script. Do note that the number for the month should be one less than normal. ie Jan=0, Feb=1. Don't ask why.